A three-axis moving vertical powder high-precision quantitative feeding device

Abstract

The present invention relates to a field of quantitative feeding technology, and in particular to a three-axis movable vertical powder high-precision quantitative feeding device suitable for fine chemical, new energy, food and pharmaceutical industries, comprising a frame, a storage bin is provided above the frame, a feed port is provided at the top of the storage bin, a discharge port is provided at the bottom of the storage bin, a switch door mechanism for closing or opening the discharge port is provided at a position near the discharge port of the frame, a feeding unit for outputting materials is provided in the storage bin, a conveying unit for conveying a container to the discharge port position of the storage bin is provided below the storage bin, a conveying platform for carrying the conveying unit is provided on the frame, and a mobile lifting unit for lifting and moving the entire conveying unit from the conveying platform is provided below the conveying unit. The present invention adopts internal vertical spiral feeding and a double-axis form of external stirring and arch breaking. The inner and outer double axes are driven by double motors respectively, and the structure is independent.

Description

Technical Field

[0001] The present invention relates to the technical field of quantitative feeding, and in particular to a three-axis moving vertical powder high-precision quantitative feeding device suitable for fine chemical, new energy, food and pharmaceutical industries. Background Art

[0002] Automatic quantitative weighing devices for powder materials are widely used in fine chemicals, new energy, food, medicine and other industries. The general application requires that the device can meet the conditions of stable operation, accurate weighing, fast operation, dust-proof structure, and no residue during transportation. At present, the existing devices are mainly divided into two forms according to the layout structure: horizontal and vertical. The feeding control is divided into various forms such as spiral feeding, vibration feeding and valve feeding. Among them, the horizontal spiral feeding device is the most common in the market because of its simple structure, convenient production and simple control. However, the disadvantages of this structure are also obvious: (1) The material at the bottom of the spiral is easy to remain, which will affect the product quality over a long period of time, such as the long-term deterioration of food powder and the long-term change of the properties of functional powder; (2) It is not suitable for powders with different material properties. For example, it is easy to cause weighing deviation for materials with poor fluidity; even for materials with strong viscosity, it is difficult to discharge normally due to material bridging or wall adhesion; (3) In addition, it is difficult to achieve accurate feeding control with the conventional structure of the horizontal spiral discharge port, so the weighing accuracy is generally not high; (4) The existing horizontal spiral device also has problems such as large dust caused by the high distance of the discharge port. Therefore, the horizontal screw feeding device can only be used for specific types of materials, has no requirements for material residue, and is not required for high weighing accuracy (generally >200g or more).

[0003] Compared with the horizontal screw, the vertical screw feeding device solves the problem of material accumulation and residue, has a faster feeding speed and more precise feeding control, and is widely used under high-precision working conditions. However, the traditional screw feeding device also has many disadvantages: (1) The function is single and is only effective for a certain type of powder, with poor applicability; (2) The driving mechanism of the feeding screw is unstable and does not have the conditions for higher precision feeding; (3) The driving motor is installed under the silo, the structure is complex and unstable, and maintenance is difficult; (4) For the traditional rotary anti-leakage closing mechanism, for materials with good fluidity, due to the excessively fast feeding speed, the closing mechanism cannot be closed in time or is not closed completely, which is easy to cause powder and dust; there is wear during the rotation process, and metal impurities are easy to fall into the material and cause pollution; (5) The structure is complex and easy to interfere; the operation is unstable and easy to get stuck. Summary of the invention

[0004] In order to solve the problems of easy interference and poor stability in the prior art, the present invention provides a three-axis movable vertical powder high-precision quantitative feeding device with reasonable and stable structural design and capable of moving arbitrarily in the X, Y and Z directions simultaneously without interference.

[0005] The technical solution adopted by the present invention to solve its technical problem is:

[0006] A three-axis moving vertical powder high-precision quantitative feeding device comprises a frame, a storage bin is arranged above the frame, a feeding port is arranged at the top of the storage bin, and a discharge port is arranged at the bottom of the storage bin. A switch door mechanism for closing or opening the discharge port is arranged near the discharge port on the frame, and a feeding unit for discharging materials is arranged in the storage bin.

[0007] A conveying unit for conveying containers to the discharge port of the storage bin is provided below the storage bin, a conveying platform for carrying the conveying unit is provided on the frame, and a movable lifting unit for lifting and moving the entire conveying unit from the conveying platform is provided below the conveying unit.

[0008] Furthermore, the feeding unit includes a spiral feeding assembly located in the center and a feeding rod assembly sleeved outside the spiral feeding assembly, the spiral feeding assembly is connected to a first driving mechanism for driving it to rotate, and the feeding rod assembly is connected to a second driving mechanism for driving it to rotate.

[0009] Furthermore, the spiral feeding assembly includes a main rotating shaft and a spiral feeding shaft fixedly connected below the main rotating shaft, the first driving mechanism includes a feeding motor installed above the main rotating shaft, the material discharging rod assembly includes a material discharging shaft cylinder sleeved on the outside of the main rotating shaft and a stirring rod assembly fixedly connected below the material discharging shaft cylinder, and the second driving mechanism includes a material discharging motor installed on the side of the material discharging shaft, and the material discharging motor is connected to the material discharging shaft cylinder through a bevel gear transmission.

[0010] Furthermore, the feed rod assembly includes a first stirring rod and a second stirring rod that are staggered, and the ends of the first stirring rod and the second stirring rod are both L-shaped, and the extension direction of the first stirring rod end intersects with the spiral feeding shaft, and the extension direction of the second stirring rod end is away from the spiral feeding shaft.

[0011] Furthermore, a bearing seat is fixed at the upper end of the storage bin, an oil seal and a bearing are arranged between the material-dispensing rotating shaft cylinder and the bearing seat, and a bearing spacer sleeve with an air blowing port is arranged between the bearings.

[0012] Furthermore, a weighing module is provided below the storage bin, and the storage bin is supported by the weighing module.

[0013] Furthermore, the conveying unit includes a base, a weighing sensor is provided on the base, a supporting support for supporting the container is provided on the weighing sensor, a mounting trough frame is provided above the supporting support, a plurality of driving rollers for transporting containers are rotatably provided on the mounting trough frame, the mounting trough frame is also provided with guide wheels on both sides of the container, and the mounting trough frame is provided with a blocking plate for blocking the container in place under the storage bin, and a proximity switch is provided at the blocking plate.

[0014] Furthermore, the mobile lifting unit includes an XYZ three-axis mobile module, the connection end of the XYZ three-axis mobile module is a Z-axis lifting end, and the Z-axis lifting end is also equipped with a lifting cylinder for lifting the conveying unit. The lifting cylinder lifts or lowers the components above the weighing sensor.

[0015] Furthermore, the opening and closing door mechanism includes a horizontal rotating shaft, the horizontal shaft is connected to a swing cylinder that drives it to rotate, the axis of the horizontal rotating shaft is staggered from the center of the discharge port of the storage bin, a material receiving box is fixed to the end of the horizontal rotating shaft, and the material receiving box has a sealing gasket for sealing the discharge port.

[0016] Furthermore, the frame is provided with a sealing cover for sealing the material storage bin discharge port and the following components from the outside world.

[0017] Beneficial effects:

[0018] (1) The present invention adopts an internal vertical spiral feeding and a double-shaft form with external stirring and arch breaking. The inner and outer double shafts are driven by double motors respectively and have independent structures.

[0019] The dual-axis drive is stable and cooperates with precision bearings to ensure that the dual axes are always in the center position and rotate smoothly, ensuring the feeding stability of the spiral feeding shaft and improving the feeding accuracy;

[0020] At the same time, the external stirring arch breaks to prevent material accumulation, ensuring that powders with poor fluidity can be fed normally; the stirring shaft drive is speed-adjustable, and the stirring speed can be adjusted according to the different properties of the real-time powder, with strong applicability;

[0021] It is equipped with an oil seal for sealing, and the bearing spacer sleeve is equipped with an air blowing port for automatic air blowing and dust prevention, ensuring that the bearing runs stably and smoothly without jamming;

[0022] (2) The dual drive motors are installed above the storage bin to achieve independent rotation of the dual shafts; easy installation and maintenance;

[0023] (3) The discharge port is equipped with a door opening and closing mechanism, which is simple and quick to operate, clean and neat, and has good sealing performance. It can seal the discharge port in time to prevent leakage, and is also applicable to powders with strong fluidity;

[0024] (4) Dual weighing sensors are used, located in the weighing storage bin and the receiving platform (or receiving container) respectively. The dual weighing sensors work together to accurately weigh and ensure high-precision feeding. At the same time, the storage bin weighing module can also be linked with the upper process to ensure reasonable feeding of the storage bin;

[0025] (5) The receiving platform adopts X, Y, and Z three-axis mobile receiving, with stable drive, precise stroke, and smooth three-axis movement; X, Y, and Z axes can move simultaneously, and the Z axis moves in conjunction with the X and Y axis moving receiving process to ensure that the distance between the receiving point and the discharge port remains unchanged. This movement mechanism can more effectively fill the receiving container, ensuring that the powder inside the container is uniform and the surface is flat; the Z axis can control the height of the receiving material to reduce dust;

[0026] (6) The conveying unit can be driven in both forward and reverse directions, and the entire device can fully adapt to different conveying direction conditions;

[0027] (7) The overall frame of the device is sealed to prevent external dust pollution and effectively prevent dust from polluting the environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0029] Figure 1 It is a front view of the quantitative feeding device of the present invention;

[0030] Figure 2 for Figure 1 Sectional view along AA;

[0031] Figure 3 It is the structural diagram of the framework;

[0032] Figure 4 This is the structural diagram of the mobile lifting unit;

[0033] Figure 5 It is a front view of the conveying unit;

[0034] Figure 6 is a top view of the conveying unit;

[0035] Figure 7 A top view of the door opening and closing mechanism;

[0036] Figure 8 It is the structural diagram of the blanking unit;

[0037] Among them, 1. frame, 11. sealing cover, 2. storage bin, 21. feed port, 22. discharge port, 3. door opening and closing mechanism, 31. horizontal shaft, 32. swing cylinder, 33. receiving box, 34. sealing pad, 4. unloading unit, 41. spiral feeding assembly, 411. main shaft, 412. spiral feeding shaft, 413. feeding motor, 42. material dispensing rod assembly, 421. material dispensing shaft cylinder, 422. material dispensing Motor, 423, first stirring rod, 424, second stirring rod, 43, bearing spacer sleeve, 44. Oil seal, 5. Conveying unit, 51. Base, 52. Weighing sensor, 53. Supporting support, 54. Mounting trough, 55. Driving roller, 56. Guide wheel, 57. Blocking plate, 6. Conveying platform, 7. Mobile lifting unit, 71. XYZ three-axis moving module, 72. Lifting cylinder, 8. Weighing module. DETAILED DESCRIPTION

[0038] like Figures 1-2 A three-axis moving vertical powder high-precision quantitative feeding device includes a frame 1, a storage bin 2 is provided above the frame 1, a feed port 21 is provided at the top of the storage bin 2, and a discharge port 22 is provided at the bottom of the storage bin 2. The frame 1 is provided with a switch door mechanism 3 near the discharge port 22 for closing or opening the discharge port 22, and a discharge unit 4 for discharging materials is provided in the storage bin 2.

[0039] A conveying unit 5 is provided below the storage bin 2 for conveying the container to the discharge port 22 of the storage bin 2, a conveying platform 6 for carrying the conveying unit 5 is provided on the frame 1, and a mobile lifting unit 7 is provided below the conveying unit 5 for lifting and moving the entire conveying unit 5 from the conveying platform 6.

[0040] like Figure 8 The feeding unit 4 includes a spiral feeding assembly 41 located in the center and a feeding rod assembly 42 sleeved outside the spiral feeding assembly 41. The spiral feeding assembly 41 is connected to a first driving mechanism for driving it to rotate, and the feeding rod assembly 42 is connected to a second driving mechanism for driving it to rotate.

[0041] like Figure 8 The spiral feeding assembly 41 includes a main rotating shaft 411 and a spiral feeding shaft 412 fixedly connected to the bottom of the main rotating shaft 411. The first driving mechanism includes a feeding motor 413 installed above the main rotating shaft 411. The material tapping rod assembly 42 includes a material tapping shaft cylinder 421 sleeved on the outside of the main rotating shaft 411 and a stirring rod assembly fixedly connected to the bottom of the material tapping shaft cylinder 421. The second driving mechanism includes a material tapping motor 422 installed on the side of the material tapping shaft cylinder 421. The material tapping motor 422 is connected to the material tapping shaft cylinder 421 through a bevel gear transmission.

[0042] like Figure 8The material moving rod assembly 42 includes a first stirring rod 423 and a second stirring rod 424 which are staggered. The ends of the first stirring rod 423 and the second stirring rod 424 are both L-shaped, and the extension direction of the end of the first stirring rod 423 intersects with the spiral feeding shaft 412, while the extension direction of the end of the second stirring rod 424 is away from the spiral feeding shaft 412.

[0043] A bearing seat is fixed on the upper end of the storage bin 2, an oil seal 44 and a bearing are arranged between the material-dispensing rotating shaft cylinder 421 and the bearing seat, and a bearing spacer sleeve 43 with an air blowing port is arranged between the bearings.

[0044] A weighing module 8 is provided below the storage bin 2 , and the storage bin 2 is supported by the weighing module 8 .

[0045] like Figures 5-6 The conveying unit 5 includes a base 51, a weighing sensor 52 is provided in the center of the base 51, a supporting support 53 for supporting the container is provided on the weighing sensor 52, a mounting groove frame 54 is provided above the supporting support 53, a plurality of driving rollers 55 for transporting the container are rotatably provided on the mounting groove frame 54, guide wheels 56 are provided on both sides of the container, and a blocking plate 57 for blocking the container in place is provided under the storage bin 2, and a proximity switch is provided at the blocking plate 57.

[0046] like Figure 4 The mobile lifting unit 7 includes an XYZ three-axis mobile module 71. The XYZ three-axis mobile module 71 can adopt the mobile module in the prior art. In the present invention, the transmission of the XYZ three-axis mobile module 71 adopts a slider screw transmission form, and is driven by a motor and a synchronous belt. The connection end of the XYZ three-axis mobile module 71 is a Z-axis lifting end. The Z-axis lifting end is also equipped with a lifting cylinder 72 for lifting the conveying unit 5. The lifting cylinder 72 lifts or lowers the components above the weighing sensor 52.

[0047] like Figure 7 The door opening and closing mechanism 3 includes a horizontal rotating shaft 31, which is connected to a swing cylinder 32 for driving the horizontal shaft to rotate. The axis of the horizontal rotating shaft 31 is offset from the center of the discharge port of the storage bin 2. A material receiving box 33 is fixed to the end of the horizontal rotating shaft 31, and the material receiving box 33 has a sealing gasket 34 for sealing the discharge port 22.

[0048] like Figure 3 The frame 1 is provided with a sealing cover 11 to seal the discharge port 22 of the storage bin 2 and the following parts from the outside. The storage bin 2 is provided with a breathable cap assembly, which releases the bin pressure through ventilation, filtration and back-blowing, and back-blows the filtered dust back into the bin. The upper part of the bin cover is equipped with a pressure gauge to monitor the internal pressure of the bin in real time.

[0049] Working principle:

[0050] When the feeding device receives the signal of loading, the conveying unit 5 is turned on, and the receiving container is taken from the conveying line connected to it and transported to the conveying platform 6. After the receiving container is transported to the blocking plate 57, the conveying stops. The lifting cylinder 72 lifts the base 51, and lifts the receiving container and separates it from the conveying platform 6 through the weighing sensor 52. Then the Z moving unit of the XYZ three-axis moving module 71 moves to lift the entire conveying unit 5, and stably moves the receiving container to a position with a suitable distance from the discharge port 22 to start loading. The unloading unit 4 is turned on, and the internal spiral feeding shaft 412 and the external material removal rod assembly 42 rotate at the same time, and vertical spiral feeding is performed with coarse feeding first and fine feeding later. The first stirring rod 423 and the second stirring rod 424 rotate close to the silo wall to stir the powder in the silo evenly and unload smoothly without accumulation. The silo is supported by three weighing modules 8, which detect the weight in the storage silo 2 and the upper and lower weight limits in the storage silo 2 in real time. During vertical spiral feeding, the XYZ three-axis moving module 71 drives the entire conveying unit 5, and drives the material receiving container to move alternately along the X and Y directions according to the pre-set route at the same time, and always maintains the distance between the receiving point and the discharge port 22 along the Z direction to perform spiral feeding. The weighing sensor 52 detects the amount of material in the receiving container in real time. When a certain amount of material is reached, the coarse feeding becomes fine feeding; when the set amount of material is reached, the feeding is completed. Then the Z moving unit of the XYZ three-axis moving module 71 descends and resets. The door opening and closing mechanism 3 is opened, the swing cylinder 32 rotates 180°, and the material receiving box 33 quickly flips 180° and seals to the discharge port 22. Then the lifting cylinder 72 descends and resets, and the material receiving container returns to the conveying platform 6. After receiving the output signal, the blocking plate 57 on the conveying unit 5 descends, the conveying unit 5 is opened, and the container is output to the conveying line connected to it, and the feeding is completed.

[0051] It should be understood that the specific embodiments described above are only used to explain the present invention, and are not used to limit the present invention. Obvious changes or modifications derived from the spirit of the present invention are still within the protection scope of the present invention.

Claims

1. A three-axis moving vertical powder high-precision quantitative feeding device, characterized in that : The invention comprises a frame (1), a storage bin (2) is arranged above the frame (1), a feeding port (21) is arranged at the top of the storage bin (2), a discharging port (22) is arranged at the bottom of the storage bin (2), a switch door mechanism (3) for closing or opening the discharging port (22) is arranged on the frame (1) near the discharging port (22), and a material discharge unit (4) for discharging materials is arranged inside the storage bin (2); A conveying unit (5) is provided below the storage bin (2) for conveying the container to the discharge port (22) of the storage bin (2); a conveying platform (6) for carrying the conveying unit (5) is provided on the frame (1); and a movable lifting unit (7) is provided below the conveying unit (5) for lifting and moving the entire conveying unit (5) from the conveying platform (6); The unloading unit (4) comprises a spiral feeding assembly (41) located at the center and a material shifting rod assembly (42) sleeved outside the spiral feeding assembly (41), wherein the spiral feeding assembly (41) is connected to a first driving mechanism for driving the spiral feeding assembly (41) to rotate, and the material shifting rod assembly (42) is connected to a second driving mechanism for driving the spiral feeding assembly (41) to rotate. The spiral feeding assembly (41) comprises a main rotating shaft (411) and a spiral feeding shaft (412) fixedly connected below the main rotating shaft (411); the first driving mechanism comprises a feeding motor (413) installed above the main rotating shaft (411); the material tapping rod assembly (42) comprises a material tapping rotating shaft cylinder (421) sleeved on the outside of the main rotating shaft (411) and a stirring rod assembly fixedly connected below the material tapping rotating shaft cylinder (421); the second driving mechanism comprises a material tapping motor (422) installed on the side of the material tapping rotating shaft cylinder (421); the material tapping motor (422) and the material tapping rotating shaft cylinder (421) are connected via a bevel gear transmission; The material moving rod assembly (42) comprises a first stirring rod (423) and a second stirring rod (424) which are staggered, the ends of the first stirring rod (423) and the second stirring rod (424) are both L-shaped, and the extension direction of the end of the first stirring rod (423) intersects with the spiral feeding shaft (412), while the extension direction of the end of the second stirring rod (424) is away from the spiral feeding shaft (412); A bearing seat is fixed to the upper end of the material storage bin (2), an oil seal (44) and a bearing are provided between the material shifting shaft cylinder (421) and the bearing seat, and a bearing spacer sleeve (43) with an air blowing port is provided between the bearings; A weighing module (8) is provided below the storage bin (2), and the storage bin (2) is supported by the weighing module (8); The conveying unit (5) comprises a base (51), a weighing sensor (52) is arranged at the center of the base (51), a supporting support (53) for supporting the container is arranged on the weighing sensor (52), a mounting slot frame (54) is arranged above the supporting support (53), a plurality of driving rollers (55) for transporting the container are rotatably arranged on the mounting slot frame (54), guide wheels (56) are also arranged on both sides of the container, and a blocking plate (57) for blocking the container in place is arranged under the storage bin (2), and a proximity switch is arranged at the blocking plate (57); The mobile lifting unit (7) comprises an XYZ three-axis mobile module (71), the connection end of the XYZ three-axis mobile module (71) is a Z-axis lifting end, and the Z-axis lifting end is also equipped with a lifting cylinder (72) for lifting the conveying unit (5), and the lifting cylinder (72) lifts or lowers the components above the weighing sensor (52).

2. According to claim 1, a three-axis moving vertical powder high-precision quantitative feeding device is characterized in that: The door opening and closing mechanism (3) comprises a horizontal rotating shaft (31), the horizontal rotating shaft (31) is connected to a swing cylinder (32) for driving the horizontal rotating shaft (31) to rotate, the axis of the horizontal rotating shaft (31) is offset from the center of the discharge port of the storage bin (2), a material receiving box (33) is fixed to the end of the horizontal rotating shaft (31), and the material receiving box (33) is provided with a sealing gasket (34) for sealing the discharge port (22).

3. The three-axis moving vertical powder high-precision quantitative feeding device according to claim 1 is characterized in that: The frame (1) is provided with a sealing cover (11) for sealing the discharge port (22) of the storage bin (2) and the following components from the outside.

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